This is the definitive independent critical review of Deep Purple from the halcyon days of the Mark II Gillan/Glover/Blackmore/Lord/Paice line up through to the final Mark IV line up with David Coverdale, Glenn Hughes and Tommy Bolin. We cover the dramatic departure of Gillan and Blackmore, the in-fighting between the members of the band and the long term effects this had on Deep Purple and the music. Featuring rare archive material, much of it appearing on DVD for the first time, along with incisive commentary from a leading team of music critics and working musicians. Includes rare footage of performances of Concerto for Group and Orchestra, Mandrake Root, Speed King, Child In Time, Fireball, Highway Star, Lazy, Smoke on The Water, Woman From Tokyo, Burn and many more. Editorial Control: This project requires totally independent editorial control. This film is unauthorised and is not associated or approved in any way by present or past members of Deep Purple or the management of the group.